/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
 * Copyright © 2017-2018 Amdocs
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */
package org.onap.crud.logging;

import org.onap.aai.cl.api.LogFields;
import org.onap.aai.cl.api.LogLine;
import org.onap.aai.cl.api.Logger;
import org.onap.aai.cl.mdc.MdcContext;
import org.onap.crud.util.CrudServiceConstants;
import org.slf4j.MDC;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;

public class LoggingUtil {
  /**
   * Initializes mdc context.
   */
  public static void initMdcContext(HttpServletRequest httpReq, HttpHeaders headers) {
    String fromIp = httpReq.getRemoteAddr();

    MdcContext.initialize(getTransactionId(headers), CrudServiceConstants.CRD_SERVICE_NAME, "", getAppId(headers), fromIp);
  }
  
  public static String getAppId(HttpHeaders headers) {
    String fromAppId = "";
    if (headers.getRequestHeaders().getFirst("X-FromMsId") != null) {
      fromAppId = headers.getRequestHeaders().getFirst("X-FromMsId");
    } else if (headers.getRequestHeaders().getFirst("X-FromAppId") != null) {
      fromAppId = headers.getRequestHeaders().getFirst("X-FromAppId");
    }
    return fromAppId;
  }
  
  public static String getTransactionId(HttpHeaders headers) {
    String transId = null;
    if ((headers.getRequestHeaders().getFirst("X-TransactionId") == null)
      || headers.getRequestHeaders().getFirst("X-TransactionId").isEmpty()) {
      transId = java.util.UUID.randomUUID().toString();
    } else {
      transId = headers.getRequestHeaders().getFirst("X-TransactionId");
    }
    return transId;
  }

  /**
   * Logs the rest request.
   */
  public static void logRestRequest(Logger logger, Logger auditLogger, HttpServletRequest req, Response response) {
    String respStatusString = "";
    if (Response.Status.fromStatusCode(response.getStatus()) != null) {
      respStatusString = Response.Status.fromStatusCode(response.getStatus()).toString();
    }

    // Generate error log
    logger.info(CrudServiceMsgs.PROCESS_REST_REQUEST, req.getMethod(), req.getRequestURL().toString(),
        req.getRemoteHost(), Integer.toString(response.getStatus()));

    // Generate audit log.
    auditLogger.info(CrudServiceMsgs.PROCESS_REST_REQUEST,
        new LogFields().setField(LogLine.DefinedFields.RESPONSE_CODE, response.getStatus())
            .setField(LogLine.DefinedFields.RESPONSE_DESCRIPTION, respStatusString),
        req.getMethod(), req.getRequestURL().toString(),
        req.getRemoteHost(), Integer.toString(response.getStatus()) + " payload: "
            + (response.getEntity() == null ? "" : response.getEntity().toString()));
    MDC.clear();
  }
}